Superheater



Aug. 29, 1933.

A. HUET 1,924,932

SUPERHEATER Filed Jan. 28, 1931 2 Sheets-Sheet 1 G IHIIIIII a ufi'la/r flue INVENTOR ATTORNEY Aug. 29, 1933.

A. H U ET SUPERHEATER Filed Jan. 28. 1951 2 Sheets-Sheet 2 y/ldre 74 057 INVENTOR ATTORNEY Patented Aug. 29, 1933 UNITED STATES 1,924,933 SUPERHEATER Andr Huet, Paris, France, assignor to The superheater Company, New York, N. Y.

Application January 28, 1931; Serial No. 511,873,

and in France July 3, 1930 Claims.

The present invention has for its object a process for superheating whereby it is possible to obtain with practically constant regularity any temperature desired for the steam on its to thepoint of utilization.

The process forming the subject of the invention consists essentially in admitting into contact with the superheater first high temperature gases coming from the boiler furnace and secondly a certain quantity of gases which have already given some heat to the superheater and to the boiler and to regulate the composition of this mixture in such a way as to obtain the desired temperature at the superheater outlet.

The relatively cooled gases may be either taken at the outlet of the boiler or at some intermediate point. The latter will be the case when it is thought preferable and particularly when it is thought desirable to shorten thelength of the passages and to interfere as little as possible with the normal operation of the boiler.

The process for superheating which forms the subject-matter of the present invention is applicable to all boiler types, not only to stationary boilers, but also to marine and locomotive boilers.

The following description which has reference to the accompanying drawings, gives examples whereby one can easily understand how the invention may be put into practice.

Figs. 1 and 2 represent respectively a side View partially in section, and a section on line 2-2 of Fig. l of a marine boiler whose combustion chamber is provided with water tubes.

Figs. 3 and 4 are similar views, the sections being respectively on line 3-3 of Fig. 4 and 4-4 on Fig. 3 of a boiler of the horizontal water tube type.

Fig. 5 is a section on a larger scale of a detail.

Figs. 6 and 7 are respectively a side view and a sectional view on line 7-7 of Fig. 6 of a water tube locomotive.

Fig. 8 is a transverse section of a Stirling type boiler with the invention applied.

Fig. 9 is a longitudinal section of a Scotch 5 Marine boiler with my invention applied.

high temperature gases coming from the furnace are drawn from the smoke box 5 by a small fan 6 or any other equivalent apparatus and are forced through the conduit 7 to a blower 8 which opens below the superheater elements in the space containing the superheater. After having given up their heat to the superheater the mixture of hot gases and cooled gases goes over the remaining part of the boiler together with the portion of the furnace gases which have not traversed the space reserved for the superheater.

Figs. 3 and 4 show a boiler of the horizontal water tube type comprising tube banks 9 arranged between inclined headers 10 and 11 and connected to drums 12. The gas path is determined in a known way by bafiles 13. The super heater, designated collectively by the reference numeral 14, is placed in the first pass. The reclaimed gases which are taken from the space 15 beyond the tubes 9 are forced into the three spaces or compartments 16 provided for the superheater and are injected through the duct '17 of which a transverse section is shown in Fig.

5. This duct is provided with openings v dividing the reclaimed gases and making it possible to obtain a proper mixture with the gases coming directly from the furnace.

In Fig. 6 a water tube boiler for locomotives is shown comprising two superheaters l8 and 18 one of which serves to superheat the steam before it has been expanded and the other to superheat the intermediate steam between two pressure stages. The two superheaters are separated by a partition 19.

The gases coming from the smoke box are carried by means of a conduit 20 to a header 21 from which they flow by means of ducts preferably arranged obliquely and dividing the reclaimed gases into parallel streams in the direcall tion of the gas circulation coming from the furnace. It will be understood that the cooled gases may be directed if it is desired either over 7 both superheaters or over only one.

In Fig. 8 there is shown a boiler of the Stirling type with a superheater 22 arranged immediately at the outlet from the furnace. cooled gases which have circulated over the tube banks 23 is carried back by means of the conduit 24 to a point below the superheater 22, which is shown in a duct spaced in front of the front tube bank 23 so that much of the gas stream from the furnace may pass to the generating banks direct without contacting with the superheater. I Y

Finally in the form of the invention shown in A part of the g Fig. 9 the superheater 27 arranged in advance of the boiler 28 receives not only a part of the gases coming from the furnace but also cooled gases taken by the blower 29 or an equivalent device from a point intermediate between the superheater and the boiler.

It goes without saying that modifications of the details may be made in the arrangement just described Without departing from the spirit of the invention.

I claim: I

1. Process of generating and superheating steam in a superheater boiler comprising the steps of generating heating gases in a furnace, causing at least some of said gases to come into contact with boiler surfaces, causing at least some of said gases to come into contact with superheater surfaces, mingling with said gases just before they come into contact with the superheater surfaces some gases taken from a point beyond the superheater with respect to the gas flow, and regulating the amount of said last named gases to control the degree of superheat.

2. The process according to claim 1, all of the gases generated in the furnace coming into contact with superheater surfaces and thereafter with boiler surfaces.

3. The process according to claim 1, the last named gases being taken from a point just beyond the superheater before they have come into contact with further boiler surfaces.

4. The combination with a vapor generator and a superheater for the vapor from said generator of a furnace common to said generator and superheater, said generator having generating surface arranged to contact with the entire stream of gases from said furnace, said superheater arranged to contact with a portion only of the gases from said furnace, and means to mix with the furnace gases going to said superheater a regulable amount of gases taken from a point in the gas stream beyond such group in the direction of gas flow.

5. The combination in a superheater boiler hav ing a furnace of generating surface arranged to contact the entire stream of gases from said furnace, a group of superheater elements arranged to contact only a part of said stream, and means to mix with the furnace gases going to said group a regulable amount of gases taken from the point in the gas stream beyond such group.

ANDRE HUET. 

